Suppressing a voice in the midi output

[Karsten Reincke]

Dear friends;

In the LilyPOnd tutorial I found the explanation how to assign each a voice a
separate midi channel = instrument 

http://lilypond.org/doc/v2.18/Documentation/notation/creating-midi-files

Unfortunately, I have to prevent one / some voice(s) from being ingrated into 
the
midi file (because it only contains meta information which shall not be played).

Does anyone know how I can say that voice X shall not be converted into the midi
file? Or does any know how I could assign this voice 'a silent instrument'?

Many thanks for your help
Karsten

-- 
  Karsten Reincke    /\/\   (+49|0) 170 / 927 78 57
 Im Braungeröll 31   >oo<  mailto:address@hidden
60431 Frankfurt a.M.  \/    http://www.fodina.de/kr/